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Rheem help needed

Imperial 80 plus. Model rgde-12rajs. It's an old unit. Unit fires and turns off. After running 3 cycles it shuts off and does not fire. The fan also stays on when no heat commands are given even when the thermostat is unwired. Any ideas ?

Must add I did get it to run for a few hours but after reaching the thermostat temp is shut off and has not run properly since.